| Author: | Ilsley, L. C. | 
|---|---|
| Year: | 1930 | 
| Document Type: | MAIN | 
| Issuing Agency: | U.S. Dept. of Commerce, Bureau of Mines, | 
| SUDOC: | C 22.11:6267 | 
| Series: | Information circular / Bureau of Mines ; | 
| Report Number: | 6267 | 
| Subject: | Mine safety | 
| Link: | https://hdl.handle.net/2027/mdp.39015095083625 |